centos man page for vfree

VFREE(9)						    Memory Management in Linux							  VFREE(9)

NAME
       vfree - release memory allocated by vmalloc

SYNOPSIS
       void vfree(const void * addr);

ARGUMENTS
       addr
	   memory base address

DESCRIPTION
       Free the virtually continuous memory area starting at addr, as obtained from vmalloc, vmalloc_32 or __vmalloc. If addr is NULL, no
       operation is performed.

       Must not be called in NMI context (strictly speaking, only if we don't have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, but making the calling
       conventions for vfree arch-depenedent would be a really bad idea)

NOTE
       assumes that the object at *addr has a size >= sizeof(llist_node)

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014								  VFREE(9)